Retractable blade utility knife



FIG. 1 is a front, top, right side perspective view.

FIG. 2 is a right side view.

FIG. 3 is a left side view.

FIG. 4 is a top plan view.

FIG. 5 is a bottom plan view.

FIG. 6 is a rear elevational view; and,

FIG. 7 is a front elevational view. 

The ornamental design for a retractable blade utility knife, as shown. 